Marché's decomposition conjecture for Kauffman bracket skein modules

Let MM be a closed oriented 33-manifold, and let S2,(M)\mathcal S_{2,\infty}(M) denote its Kauffman bracket skein module over Z[A±1]\mathbb Z[A^{\pm 1}]. Marché's decomposition conjecture. There exists an integer d>0d>0 and finitely generated Z[A±1]\mathbb Z[A^{\pm 1}]-modules NkN_k such that

S2,(M)Z[A±1]dk1Nk,\mathcal S_{2,\infty}(M)\cong \mathbb Z[A^{\pm 1}]^d\oplus\bigoplus_{k\geq 1}N_k,

where NkN_k is an (AkAk)(A^k-A^{-k})-torsion module for each integer kk. Marché proposed this as a structural description of skein modules of closed oriented 33-manifolds, but it has been disproved by counterexamples, including the skein module of the connected sum of two copies of RP3\mathbb{R}P^3 and, in this paper, the connected sum of two copies of S1×S2S^1\times S^2.

Sources & referencesView supporting material

Primary source

Rhea Palak Bakshi, Seongjeong Kim, Shangjun Shi and Xiao Wang, “On the Kauffman bracket skein module of (S^1 S^2) \ \# \ (S^1 S^2)”, arXiv:2405.04337 (2025).

Additional references

2 papers in this index state this conjecture (2022–2024). The statement above is taken from the most recent of them; the others are arXiv:2205.01653.

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